Rotary pump



2 Sheets-Sheet 1 (No Model.) v

. B. P. SMITH.

- ROTARY PUMP. N0. 5Z7,082. Patented Oct. 9, 1894.

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11/11/1111!!! III/Ill (No Model.) 2 Sheets-Sheet 2. E. F. SMITH.

. ROTARY PUMP. No. 527,082. Patented Oct. 9, 1894.

'WILqEEEEE. 4 I vEqLmR. w'anzl smaf UNITED I STATES:

PATENT; OFFICE.

EDWARD F.-SMITH, OF ERIE, PENNSYLVANIA.

ROTARY PUM P.

SPECIFICATION forming part of Letters Patent No. 527,082, dated October 9, 1894.

Application filed March 16 1893.

To all whom it may concern.-

Be itknown that I, EDWARD F. SMITH, a citizen of the United States, residing at the city of Erie, in the county of Erie and State of marked thereon, forming part of this specifi cation. I

My invention consists in the improvements in rotary pumps hereinafter set forth and explained and illustrated in the accompanying drawings, in whichh Figure 1 is an end view in elevation of the shell of my improved rotary pump with one head and the rotating cylinder andvalves carried thereby removed. Fig. 2 is a perspective View of the rotating cylinder of my improved rotary pump, with the valves therein. Fig. 3 is a view in elevation of one of the valves removed from the rotating cylinder of my improved-rotary pump. Fig.4:is atransverse section of the cylinder of same. Fig. 5 is a longitudinal section of the rotating cylinder of my improved rotary pump, with the valves removed therefrom, on the line was, in Fig. 4, looking in the direction of the arrow. Fig. 6 is a vertical section of a portion of the shell of my'improved rotary pump, on the line 11 y, in Figs. 1 and 7, looking in the direction of the arrow. Fig. 7 is a vertical transverse section of a portion of the shell of my improved rotary pump on the line 2, z, in Fig. 6,

looking in the direction of the arrow. Fig. 8 is a longitudinal section of the lower part of the shell of my improved rotary pump, on the .line y, y, in Figs. 7 and 9, looking in the di- Serial No. 466,375- (NomocleL) the top of In the upper part of the shell A directly under the discharge opening-D, I make chambers E, the under surfaces of which are formed by annular projections or lips F, F, which are secured to and'form part .of the periphery of the shell A; these projections or lips F being, however, separated some distance from each other, so as to leave an opening G between them, as illustrated in Fig. 6, the ends e of these annular projections or lips extending to and formingpart of the periphery of the shell A, while the ends f thereof are cut away, so as to leave a longitudinal or T shaped opening d, as illustrated in Figs. 6 and 7. The inlet 0 of the shell A, is also provided with annular projections or lips P, P, which are secured to and form part of the periphery of the shell A, these annular projections or lips P being however, separated some distance from each other, so as to leave an oblong opening Q between them, as illustrated in Fig. 8, the ends p of these projections or lips extending to and forming part of the periphery of the shell A, while the ends P thereof are cut away, so as to leave a longitudinal or T shaped opening q for part of the inlet of the pumpas illustratedin Figs. 8 and 9. These lips or projections F, F, over the sides of the outlet, and P, P, over the sides of the inlet of the pump, perform two functions, one of which is to present greatly enlarged wearing surfaces to the peripheries of the radially moving valves, and another is to provide discharge and inlet openings which are elongated, so as to gradually relieve the strain upon the valves during their inward and outward traverse, which these features accomplish in a most satisfactory manner,therebycontributing largely to the efficiency and durability of the pump.

.Eccentrically within the shell A, I IIIJllHlJ the shaft H, of a rotary cylinder I, which cylinder I contacts withone side of the shell A, a slight depression h being turned therein to fit the periphery of the cylinder I, so as to form a joint sufficiently tight to substantially prevent the passage of the fluid being pumped, as illustrated in Fig. 1. The shell J of the cylinder I projects some little distance beyond the heads K forming the ends thereof,

so as to contact with the heads B of the shell A. Throughthis cylinder, I out two longitudinal slots L, L, which are separated by a diaphragm M, this diaphragm operating to completely out off the leakage from one side of the cylinder to the other when the pump is in operation. These slots L are preferably parallel to each other, and extend, one, through one side of the shell J of cylinder 1, and the other through the opposite side of the shell on the opposite sides of the diaphragm M. These slots L, L, extend through the shaft H, as illustrated in Fig. 4, or may, if desired be placed farther apart, so that the sides of the shaft need only be slightly flattened to clear them. These slots L, L, also extend down through the heads Kof the cylinder I, some distance, as and for the purpose set forth.

In the slots L, L, in the, cylinder I, I place flat T shaped valves N (shown in Fig. 3),which slide freely in and out therein, the portions nnof the valvesN projcctingout ward through the slots L, L,in theheads K of the cylinder I flush with the ends of the shell thereof.

On the heads B, B, of the shell A, I secure cams O, O, which extend within the recesses,

formed byI the projections of the ends of the shell J of the cylinder I, beyond the heads K thereof, and engage with the projections 01. n on the valves N at each revolution of the cylinder I, and force the valves N outward, into contact with the periphery ofthe shell A, just as theyare passing the inlet opening 0 of the pump, so that they will engage the fluid being pumped, each valve passing 01f of the cams 00 just as it completes its full outward traverse and from which point the load upon thevalves prevents their backward movement in the slots L in the cylinder-I until after they pass the point of discharge at the upperpart of the shell A, when the pressure upon them being removed, they readily pass back into the slotsL flush with the periphery of the cylinder 1 until the point, of cut-01f h is passed, when they are again engaged and forced outward by the cams O, as the inside of the shell A from the point I) when the valve has taken its load to thepoint c where the load has been discharged is an arc of a circle, the center of which is coincident with the center of the shaft H of the cylinder I, so that when the valves are moved out into contact with the inside of the shell Aat the point b, by the operation of the cams 0 no further movement thereof in the slots L is required until after the load has been discharged therefrom, at and before they reachc, after which the valves move backeasilyinto the cylinder I.

From the foregoing description of the con struction and operation of my improved rotary pump, its construction and operation will be clearly understood by those conversant with rotary pumps.

Therefore, what I claim as new, and desire to secure by Letters Patent of the United States, isl The. combination in a rotary pump, of a rotating cylinder, consisting substantially of a shell provided with countersunk heads: and a central longitudinal diaphragm, forming a division separating the two halves of said cylinder, a slot at one side of said diaphragm, through one side of the periphery and of the heads of said'cylinder, and a like slot at the opposite side of said diaphragm,through the opposite side of the peripheryand of the heads of said cylinder, radially moving valves in said slots extending outward through the slots in the. countersunk heads, to the ends of the cylinder shell, and cams on the heads of the pump shell adapted to, be engaged by the ends of the valvesduring their outward movement only, substantially as set forth.

In testimony whereof I affix my signatu re in presence of two witnesses.

EDW ARD F. SMITI-I.

Witnesses:

, F. EINFELDT,

MATTHEW GRISWOLD, Jr. 

